Sewing machines



Filed Jan. I 26, 1956 4 Sheets-Sheet 1 I I F s. A m o u J. N. COVERT Sept. 16, 1958 SEW ING MACHINES Filed Jan. 26, 1956 4 Sheets-Sheet 2 J. N. COVERT SEWING MACHINES Sept. 1 1958 4 Sheets-Sheet 3 Filed Jan. 26, 1956 TGE 4 Sheets-Sheet 4 Filed Jan. 26, 1956 WHEEL mmm wdx United States Patent SEWING MACHINES John N. Covert, Lombard, 111., assignor to Union Special Machine Company, Chicago, 111., a corporation of Illi- 11015 Application January 26, 1956, Serial No. 561,406

7 Claims. (Cl. 112-210) This invention relates to a sewing machine and more particularly to the provision in such a machine of an improved form and arrangement of an adjustable eccentric and means for readily and accurately adjusting the same, to vary its throw, and for indicating its setting. The improved construction may be used in relation to any part of a sewing machine which it is desired to operate to variable extents through connections from a rotary drive shaft of the machine. However, it is especially adapted for use in varying the length of the stitches produced by the machine, by varying the feed stroke of the work feeding mechanism.

In accordance with a special embodiment of the invention, a four-motion feed dog is provided which receives its lifting and lowering movements from a crank or eccentric at the end of a lower rotary drive shaft in the base of the machine and receives its feed and return movements from a feed rocker mounted in the base and driven from an adjustable eccentric carried by the lower drive shaft adjacent the feed mechanism. The lower drive shaft is driven by a belt connection or the like from an upper drive shaft extending longitudinally of the overhanging arm of the machine. A combined handwheel and pulley carried by the upper drive shaft permits rotation of the two shafts either by hand or by power supplied through a belt from a suitable power unit.

The adjustable eccentric of the present invention is in many respects similar to that disclosed in the patent to Hale No. 2,718,860, granted September 27, 1955, but it embodies various .improvements. It is of the type having a pair of telescopically arranged eccentric elements adapted for mounting on the lower drive shaft and turnable in relation to each other to vary the overall eccentricity of the unit with respect to the axis of the drive shaft. The construction of the unit is such that it may be produced as a sub-assembly adapted to be easily and quickly applied to the drive shaft. One of the eccentrics of the unit is positively connected with the drive shaft for rotation therewith atall times. The other eccentric is normally caused, by frictional forces, to turn with the shaft and the connected eccentric but a detent is provided, which may be manually operated, to prevent said other eccentric from turning with the shaft. In this way, turning of the handwheel serves to bring about relative angular adjustment of the two eccentrics to vary the throw of the unit.

A special feature of the new adjustable eccentric unit is in connection with the provision of a housing which serves to retain the several parts in assembled relation. This housing is provided with a circumferential slot extending through its wall over a suitable arc. A notched arm carried by the frictionally driven eccentric extends groove or channel provided around the outer surface of the housing. This band provides a smooth surface on which the nose of the detent may ride when the latter is operated to permit adjustment of the unit. When the notch in the arm is brought opposite the nose of the detent, the latter will enter the notch and prevent further turning of the frictionally driven eccentric, so that subsequent turning of the handwhel in either direction will bring about relative adjustment of the two eccentrics. By firmly securing the split band to the notched arm its correct positioning in relation to the several parts is insured at all times and the band may be made to slide freely in the groove of the housing.

Another feature of the invention is the provision of a collar, in fixed relation to the drive shaft, adjacent one end of the eccentric unit for insuring proper cooperation of a pitman with the outer eccentric surface of the unit.

A further feature of the invention involves the provision of a simple form and arrangement of a detent adapted for manual operation to enable adjustment of the eccentric. The detent is a bell crank lever adapted to be operated by a depressible button mounted in a recess in the cloth plate of the base of the machine adjacent the.

eccentric unit. A spring clip carried by the cloth plate serves to rock the lever to hold one arm of the latter in engagement with a stem depending from the depressible button. This arrangement is simple and reliable in its operation and is quickly and easily assembled on the machine.

Still another feature of the invention involves the provision of an indicator, which is of simple construction and is readily observable by the operator, to show the stitch length created by the eccentric as a result of its adjustment. This comprises a flanged disk, forming a part of the combined handwheel and pulley, which is provided with indicia that are visible through an opening or window in a belt guard flange on the machine frame which extends over the belt receiving portion of the pulley to prevent injury to the operators fingers in the course of turning of the handwheel.

Other features and advantages of the invention will appear from the detailed description of a preferred embodiment of the same which will now be given in conjunction with the accompanying drawings, in which:

Fig. 1 is a front elevational view of a machine embodying the invention, portions of the frame being broken away and shown in section to illustrate certain parts;

Fig. 2 is an end elevational view of the machine as seen from the left in Fig. 1;

Fig. 3 is an enlarged detail view in longitudinal vertical section, along different planes and looking toward the front of the machine, through a portion of the work supporting base of the machine;

Fig. 4 is a transverse vertical sectional view, looking toward the right in Fig. 1, through a portion of the base in the region of the parts shown in Fig. 3;

Fig. 5 is a transverse vertical sectional view through the base of the machine, looking toward the right in Fig. 1 and taken along a plane at the left of that along which Fig. 4 is taken;

through this slot and asumes different angular positions in relation thereto as the eccentricity of the unit is adjusted. A split band formed of thin metal, such as steel,

has its ends secured to the notched arm, at opposite sides 0f the notch therein, and is arranged to slide freely in a Referring now to the drawings, the invention has been illustrated as applied to a lockstitch sewing machine of the type more fully disclosed in applicants copending application Serial No. 559,604, flled January 17, 1956. It

is provided with a frame having a work. supporting base. 10, a vertical standard 11, and an overhanging arm 12 terminating in a needle head 13. A rotary drive shaft 14 extends through the overhanging arm and into the needle head. It is suitably journaled in bearings provided in the arm and at the top of the vertical standard. One end of the shaft extends outwardly through the right end wall of the standard (Fig. 1) and carries a combined handwheel and pulley 15. Within the needle head 13 the shaft 14 carries a crank of well known construction which is suitably connected with a needle bar 16 for reciprocating the latter. Needle bar 16 carries at its lower end a needle 16a forming one of the stitch-forming devices of the machine. Within the vertical standard a toothed belt 17 cooperating with a toothed pulley on the shaft 14 and a corresponding toothed pulley on a shaft 18, which extends longitudinally of the base of the frame, serves to drive the shaft 18 at the same speed as the shaft 14. The shaft 18 is suitably journaled in bearings provided in the base of the frame. Within an enclosed lubricant reservoir 19 (Fig. 1), provided in the base of the frame, is suitable gearing which serves to connect the shaft 18 with a hook shaft 20, the latter being driven at double the angular speed of the shaft 18. At its outer end, shaft 20 carries a rotary hook 21 which cooperates with the needle 16a in the formation of lockstitches.

For advancing the work in relation to the stitch forming devices, a feed dog 22 (Fig. 2) is provided, this being adjustably mounted by a screw 23 on a feed bar 24. The latter is rockably mounted, by means of a rock shaft or trunnions 25, on a feed rocker 26 which is rockably mounted in the frame by means of studs or trunnions 27. A downwardly'extending arm 24a of the feed bar carries a pivot pin 28 by means of which the lower end of a pitman 29 is connected with the feed bar. The upper end of pitman 29 carries a strap which cooperates with a crank pin or eccentric at the left end of the shaft 18. This crank, through the connections described, serves to impart the lifting and lowering movements to the feed dog.

Longitudinal movements are imparted to the feed bar 24 and the connected feed dog by means of a pitman 30 (Fig. one end of which is pivotally connected by means of a stud 31 with the feed rocker 26. At its opposite end the pitman 30 is provided with a strap 32 cooperating with an adjustable eccentric indicated generally at 33. This eccentric is carried and driven by the shaft 18 and, as will be explained, is of such construction that the throw of the eccentric may be readily varied to change the stitch length of the machine. A presser foot carried by the needle head is spring urged downwardly, in conventional manner, to cooperate with the feed dog in advancing the work.

Turning now to Figs. 7 and 8, the adjustable eccentric is provided with two telescopically arranged eccentric sleeves 34 and 35. Sleeve 34 has a cylindrical bore having a relatively close fit in relation to the shaft 18. Sleeve 35 has a cylindrical bore with a relatively close fit about the sleeve 34. It will be understood that the bores of the two eccentric sleeves are eccentric to their outer cylindrical surfaces and that the eccentricity of the outer surface of sleeve 35 in relation to the axis of shaft 18 may be varied by turning the two sleeves angularly relative to each other. A spring 36 .bears at one end against a shoulder 37a within an enlarged portion 37 of the sleeve 35. At its opposite end the spring bears against a radially extending flange 38 of the sleeve 34. Thus the spring tends to urge the two sleeves in OPP Site axial directions.

To retain the eccentric sleeves 34 and 35 in assembled relation there is provided a housing 39 which extendsover the enlarged portion 37 of sleeve 35 and a portion of sleeve 34. This housing is provided with a radially inwardly extending flange 40 arranged to cooperate with a shoulder provided by the inner face of the enlarged portion 37 of sleeve 35. Within the outer or right end of the housing there is mounted an annular member 41 having a central opening arranged to fit snugly about the shaft 18. This member is secured to the housing by screws 42 passing through the wall of the housing and having screw threaded engagement with threaded openings in the periphery of the member 41. This member is secured to the shaft 18 by a pair of set screws 43 passing through openings 43a in the housing 39 and then through threaded openings 43!) in the member 41 and arranged to have their inner ends grip the surface 'of the shaft 18. The arrangement is such that the spring 36 urges the sleeve 35 toward the left to hold the shoulder on the enlarged portion 37 in engagement with the inner face of the flange 40 of the housing while the sleeve 34 is urged toward the right to force a friction facing or element 44 at the right end of this sleeve into engagement with the inner face of the member 41. The friction facing 44 on the sleeve 34 serves to supplement the frictional drive existing between this sleeve and the shaft 18 and between the outer surface of the sleeve 34 and the inner surface of sleeve 35, so that the sleeve 34 will normally rotate with the shaft 18. Sleeve 35 is positively driven from the shaft 18 by means of a key 45 having a shank 46 fitted within an opening 47 extending through the member 41. This member, as has been explained, is firmly secured to the shaft 18. The key 45 cooperates with a notch 48 in the enlarged portion 37 of sleeve 35 to transmit a positive drive from the shaft 18 to the sleeve 35.

The major portion of the reduced part of the eccentric sleeve 35 projects outwardly toward the left from the housing 39 and is arranged to cooperate with the strap 32 of pitman 31. A needle bearing unit 49 is preferably provided between the strap and the surface of the eccentric sleeve 35. To retain the strap and the needle bearing unit on the sleeve 35, a collar 50 is secured to the shaft 18, by means of set screws-51, adjacent the right end of the sleeve 35.

Inner eccentric sleeve 34 is provided with a radially extending arm 52 having a notch 53 at its outer end. This notch, which is preferably substantially V-shaped, divides the arm into two branches 54 and 55. As will be seen in Figs. 7 and 8 the main part of the arm 52 is thinner in an axial direction than the branches 54 and 55 thus forming an inverted L-shaped configuration. This provides room for the spring 36 and enables the axial dimension of the unit to be kept to a minimum even though the branches 54 and 55 are relatively broad. A split band 56 formed of steel or the like, has one end 57 secured by a screw 58 to the top of the branch 54 while the opposite end 59 of the band is secured by a screw 60 to the top of the branch 55. The arrangement is such that the V-notch 53 is left open at its top.

It should be noted in connection with the foregoing that the several parts of the unit as illustrated in the exploded perspective view of Fig. 7 are not shown in the relationship which they assume upon assembly of the unit. Certain of the parts, notably the housing 39, must be turned through an angle of about 180 for assembly. They are illustrated in the manner shown for the purpose of more clearly bringing out certain details of the parts. When the unit is assembled the branches 54 and 55 of arm 52 extend through a slot or opening 39a provided around a portion of the circumference of the housing. This opening extends through an arc of about as best shown in Fig. 4, and permits the angular adjustment of sleeve 34 in relation to sleeve 35. It will be noted ,that the enlarged portion 37 of the latter is cut away over a corresponding arc to permit such relative angular movement between the two sleeves. Split .band 56, when theunit is assembled, fits in a groove or channel 39b extending around the central portion of the housing 39, the arrangement being such that the split band may slide within this channel and the outer surface of the band is substantially flush with the balance of the outer surface of the housing. As best shown in Fig. 8 the arrangement and form of the housing 39, member 41, collar 50 and related parts are such as to provide a rather tight closure around the inner elements of the unit.

For the purpose of efiecting adjustment of the eccentric a detent, designated generally as 61, in the form of a bell crank lever is rockably mounted on a screw stud 62 (Figs. 3 and 4) secured to a downwardly extending wall 63 of the base of the frame. A spring clip 64 cooperating with a groove in the screw stud 62 serves to retain the lever'61 on the screw stud. A rearwardly extending arm 65 of the lever 61 is normally urged upwardly by a bent spring element 66 secured to the under surface of the cloth plate of the base of the machine by means of a screw 67. This spring element has a portion which extends under the arm 65 and holds the latter against the lower end of the pin or plunger 68 and urges this upwardly into the position shown in Fig. 3, in which a washer or spring clip 69 carried by the plunger is engaged with the under surface of a downwardly extending portion of the cloth plate. At its upper end the plunger 68 carries a button 70 by means of which it may be manually depressed. The button 70 is vertically movable within a recess 71 in the top of the cloth plate to permit such depression of the button and the plunger. Another arm 72 of the lever 61 is turned outwardly to provide a nose 73, preferably rounded at its outer end. This nose is adapted to enter the V-notch 53 of the arm 52 of the inner eccentric sleeve 34 when the button 70 is depressed into the position shown in Fig. 4.

When it is desired to change the adjustment of the eccentric unit the button 70 is depresseduntil the nose 73 of the arm 72 is engaged with the outer surface of the split band 56. The handwheel is then turned by the operator, while pressure is maintained on the button 70, until the notch 53 is brought into alignment with the nose 73. At this time the continued pressure on the button 70 will force the nose 73 into the notch 53. With the parts in this condition the handwheel may be turned to a suitable extent in either direction to bring about the desired adjustment of the unit. It will be understood that upon such turning of the handwheel the inner eccentric sleeve 34 will be held against rotation while the outer eccentric sleeve 35, which is positively driven by the shaft 18, will turn relative to the sleeve 34.

The preferred from of the combined handwheel and pulley employed in accordance with the invention and 1 its relation to the frame of the machine are best illustrated in Figs. 1, 6, and 9. As there shown, the combined handwheel and pulley has a grooved belt receiving member 74, preferably formed of cast steel or the like, having a laterally extending sleeve or hub carried by the upper shaft 14. Member 74 is secured to the shaft by means of one or more set screws 75. Secured to the member 74 is a flanged, hand-engageable member 76, formed of a suitable plastic or the like, this being secured to member 74 by means of screws 77. Preferably washers 78 and '79 are provided at the opposite faces of a radially extending web portion of member 76 and a ring 80, formed of metal or the like, is held against the outer face of washer 79. All of the parts described are held in assembled relation by the screws 77 On the opposite side of the member 74 there is provided a cupped or flanged member 81 having a radially extending web portion securely held against the inner face of pulley member 74 by means of screws 82. The axially extending flange portion of this member is provided with suitable indicia 81a (Fig. 1) adapted to indicate the adjustment of the adjustable eccentric in terms of stitch length or the like. The indicia 81a are visible through an opening or window 83a provided in a flange 83 extending outwardly from the vertical standard 11 of the frame of the machine. Window 83a may suitably be a small Lucite plug. Flange 83 extends over the members 81 and 74 of the combined handwheel and pulley and serves as a guard to protect the fingers of the operator in the turning of the handwheel by hand. At the front of the machine the flange 83 extends to a point adjacent the bottom of the vertical standard, but on the rear side it extends downwardly only to about a horizontal plane extending through the axis of the shaft 14. This is to avoid interference with the belt which is usually angled rearwardly and downwardly in its connection with the pulley of an electric transmitter or the like.

It will be understood that the indicia 81a in co-operation with the window 83a will indicate the setting of the adjustable eccentric only when the eccentric unit is turned into the position in which the nose 73 of arm 72 is aligned with the notch 53.

While an illustrative embodiment of the invention has been described in considerable detail, it should be understood that various changes may be made in the construction within the scope of the appended claims.

. What is claimed is:

1. In a sewing machine having a frame, a rotary drive shaft journaled in said frame, a device to be driven by said shaft to variable extents, connections from said shaft for driving said device, said connections including an adjustable eccentric having two telescopically arranged inner and outer eccentric sleeves surrounding said shaft, said outer sleeve being positively connected with said shaft for rotation thereby, said inner sleeve being normally rotated with said shaft and said outer sleeve by frictional contact therewith, a housing secured to said shaft and surrounding a portion of said sleeves to retain the same in assembled relation, said housing having an arcuate slot extending through the wall thereof in a circumferential direction, an arm rigidly carried by said inner sleeve and extending through said slot, said slot being of sufficient length in relation to the circumferential dimension of said arm to permit turning of said inner sleeve to a limited extent in relation to the housing, said arm having its outer end widened in an axial direction and notched to divide the same into two branches, a split band surrounding said housing and having its ends firmly secured to the branches at the outer end of said arm in a manner to close said slot but leave said notch exposed, a movable detent carried by said frame and having a hose adapted to be brought into engagement with the outer surface of said band, and means for turning said shaft by hand to bring said notch into alignment with the nose on said detent for'entry of said nose into said notch so that said inner sleeve will be held against rotation with said shaft upon further turning of the same.

2. In a sewing machine having a frame, a rotary drive shaft journaled in said frame, a device to be driven by said shaft to variable extents, connections from said shaft for driving said device, said connections including an adjustable eccentric having two telescopically arranged inner and outer eccentric sleeves surrounding said shaft, said outer sleeve being positively connected with said shaft for rotation thereby, said inner sleeve being normally rotated with said shaft and said outer sleeve by frictional contact therewith, a housing secured to said shaft and surrounding a portion of said sleeves to retain the same in assembled relation, said housing having an arcuate slot extending through the wall thereof in a circumferential direction, a channel provided around the outer surface of said housing in the region of said slot, an arm rigidly carried by said inner sleeve and extending through said slot, said slot being of sufficient length in relation to the circumferential dimension of said arm to permit turning of said inner sleeve to a limited extent in relation to the housing, said arm having a notch in its outer end serving to divide the same into two branches,

a split band surrounding said housing and having its ends firmly secured to the branches of said arm in a manner to leave said notch exposed, said band having a sliding fit within said channel in the outer surface of said housing, a movable detent carried by said frame and having a nose adapted to be brought into engagement with the outer surface of said band, and means for turning said shaft by hand to bring said notch into alignment with the nose on said detent for entry of said nose into said notch so that said inner sleeve will beheld against rotation with said shaft upon further turning of the same.

3. In a sewing machine having a frame, a rotary drive shaft journaled in said frame, a device to be driven by said shaft to variable extents, connections from said shaft for driving said device, said connections including an adjustable eccentric having two telescopically arranged inner and outer eccentric sleeves surrounding said shaft, said outer sleeve being positively connected with said shaft for rotation thereby, said inner sleeve being normally rotated with said shaft and said outer sleeve by frictional contact therewith, a housing secured to said shaft and surrounding a portion of said sleeves to retain the same in assembled relation, said outer sleeve having a portion thereof extending outwardly of said housing, a pitman having a strap surrounding said portion of said sleeve and its opposite end connected with said device to be driven, a collar on said shaft closely adjacent the end of said outer sleeve arranged to close off the end of said sleeve and to retain said strap thereon, said housing having an arcuate slot extending through the wall thereof in a circumferential direction, an arm rigidly carried by said inner sleeve and extending through said slot, said slot being of suflicient length in relation to the circumferential dimension of said arm to permit turning of said inner sleeve to a limited extent in relation to the housing, said arm having a notch in its outer end serving to divide the same into two branches, a split band surrounding said housing with a sliding fit in relation thereto and having its ends firmly secured to the branches of said arm in a manner to leave said notch exposed, a movable detent carried by said frame and having a nose adapted toupon further turning of the same.

4. In a sewing machine having a frame with a work supporting base, a vertical standard and an overhanging arm, a pair of interconnected drive shafts extending 10H? gitudinally of said base and said arm, respectively, a combined handwheel and pulley secured to said shaft extending longitudinally of said arm, work feeding means in said base comprising a four motion feed dog, connections from said shaft in said base for operating said feed dog, said connections including an adjustable eccentric having two telescopically arranged inner and outer eccentric sleeves surrounding said shaft, said outer sleeve being positively connected with said shaft for rotation thereby, said inner sleeve being normally rotated with said shaft and said outer sleeve by frictional contact therewith, a housing secured to said shaft and surrounding a portion of said sleeves to retain the same in assembled relation, said housing having an arcuate slot extending through the wall thereof in a circumferential direction, an arm rigidly carried by said inner sleeve and extending through said slot, said slot being of suflicient length in relation to the circumferential dimension of said arm to permit turning of said inner sleeve to a limited extent in relation to the housing, said arm having its outer end widened in an axial direction and notched to divide the same into two branches, a split band surrounding said housing and having its ends firmly secured to the branches at the outer end of said arm in a manner to leave said notch exposed, a movable detent carried by said frame and having a nose 8 adapted to be brought into'engagement with the outer surface of said band, and means for turning said shaft by hand to'bring said notch into alignment with the nose on said detent for entry of 'saidnose into said notch so that said inner sleeve will'be held against rotation with said shaft upon further turning of'the same.

5.'A sewing machine-comprising a frame having a work supporting base, a vertical standard and an overhanging arm, a pair of interconnected drive shafts one extending longitudinally ofsaid base and a second extending longitudinally of said overhanging arm, a combined handwheel and pulley secured to said second shaft and having a belt receiving portion for supplying power thereto and another portion enabling turning thereof by hand, a flange carried by said frame and extending over said belt receiving portion of said combined handwheel and pulley, a feed dog, operating connections from said one of said shafts for driving said feed dog, said connections including an adjustable eccentric, means for adjusting the eccentricity of said eccentric upon the manual turning of said handwheel, and means comprising indicia carried by said combined handwheel and pulley and an opening in said flange extending outwardly toward the front of said frame through which said indicia may be viewed for indicating the adjustment of said eccentric.

6 A sewing machine comprising a frame having a work supporting base, a vertical standard and an overhanging arm, a pair of interconnected drive shafts one extending longitudinally of said base and a second extending longitudinally of said overhanging arm, a combined handwheel and pulley secured to said second shaft and having a belt receiving portion for supplying power thereto and another portion enabling turning thereof by hand, a flange carried by said frame-and extending over said belt receiving portion of said combined handwheel and pulley, a feed dog, operating connections from said one of said shaftsfor driving said feed dog, said connections including an adjustable eccentric having two telescopically arranged eccentric sleeves surrounding said one of said shafts, one of said sleeves being positively connected with said shaft and the other sleeve being frictionally connected therewith, means for adjusting the eccentricity of said adjustable eccentric upon the manual turning of said handwheel, said means comprising a manually operable detent for restraining said other of said sleeves against turning with said shaft, and means comprising indicia carried by said combined handwheel and pulley and an opening in said flange extending outwardly toward the front of said frame through which said indicia may be viewed for indicating the relative positions of said eccentric sleeves.

7. A sewing machine comprising a frame having a work supporting base, a vertical standard and an overhanging arm, a pair of interconnected drive shafts one extending longitudinally of said base and a second extending longitudinally of said overhanging arm, a combined handwheel and pulley secured to said second shaft and having a belt receiving portion for supplying power thereto and another portion enabling turning thereof by hand, a feed dog in said base, operating connections from said shaft in the base for driving said feed dog, said connections including an adjustable eccentric having two telescopically arranged eccentric sleeves surrounding said shaft, one of said sleeves being positively driven by said shaft and the other sleeve being frictionally driven thereby, and means for adjusting the eccentricity of said adjustable eccentric upon the manual turning of said handwheel, said means comprising a plunger mounted in the top of ,said base and having a manually engageable head normally flush with the work supporting surface of said base adjacent said adjustable eccentric, a bell crank lever pivotally mounted in said base and having one arm thereof engaged by the end of said plunger, a spring clip carried by the top of said base and having a portion extendto restrain said other of said sleeves against rotation upon 5 turning of said handwheel.

References Cited in the file of this patent UNITED STATES PATENTS 2,491,449 Hirsch Dec. 13, 1949 2,718,860 Hale Sept. 27, 1955 2,749,860 Rockney June 12, 1956 UNITED STATES PATENT OFFICE CERTIFICATE OF CREGTIUN Patent No, 2,851,976 September is, 1958 John No Covert It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction and that the said Letters Patent should read as corrected belowa Column 2, line 8, for "handwhel" m handwheel column 5 line 50, for "from" read form. column 6 line 49, for "hose" read nose column 8, line 66 after "thereby, insert a housing and closely associated members carried by said one of said. shafts providing relatively tight closure around said sleeves ===u Signed and sealed this 13th day of January 1959,,

(SEAL) Attest: KARL H, AXLINE RUBERT C. WATSQN Commissioner of Patents Attesting Oflicer 

